The Audemars Piguet Royal Oak Chronograph 26239 was introduced in 2021. For this generation of Royal Oak Chronograph, Audemars Piguet replaced the caliber 2385 with the in-house caliber 4401, visible through the see-through case back. Reference 26239OR.GG.1224OR.01 has a frosted Pink Gold case and a Blue dial.
